Si mple, progressive, tree improvement program for Douglas-fir
By: by Roy R. Silen.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: U.S. Forest Service research note PNW -- 45.
Publisher: Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture
Published: 1966
Place of publication: Portland, Or
Language: eng
Number of pages: 13
Subjects: Douglas fir -- Breeding.; Douglas fir -- Genetics.
Notes: Caption title.

"December 1966."

Includes bibliographical references.